The recommended gauge for a 60 amp wire in a residential electrical installation is typically 6 AWG (American Wire Gauge).
# 6 copper wire.
60amp
NO must be 50amp
Use AWG # 6 wire.
Its not recommended because your new main breaker will allow up to 100 amps and your old wire can only safely handle 60amps. If you put a 60amp main breaker in the new box, that would be acceptable. No, it is perfectly safe. Because the box is overrated, there is no problem. If the box is the main panel, and not a subpanel, install a 60A main breaker so you cannot overload your service. If it is a subpanel this 60A breaker should be in the main panel.
Normally buyers have an inspection that would find a problem like this. The residential disclosure in most states has the seller disclosing any problems. But if the 60 amp wiring is working then it isn't a material fact that must be disclosed. If you had a buyers agent representing you I would be shocked if they didn't tell you to have a home inspection.
A circuit breaker is intended to protect the wiring of the circuit from overload. The larger a CB is, the faster it will operate, thus in a short circuit situation, the (say) 60Amp breaker will trip before the 30 amp one that is in series. You should only have a moderate factor of safety in your choice of CB. The wiring itself will have a recommended current rating and this is a guide as to the CB.
A #6 copper conductor with an insulation factor of 75 and 90 degrees C is rated at 65 and 75 amps respectively.
2001 honda civic under hood fuse box in slot 18 60amp fuse (EPS) what does this fuse control?
In a 1999 Ford Explorer : The 60 amp maxi fuse in the power distribution box located in the engine compartment is for the instrument panel fuse box
You can. Using these size breakers in a 60 amp sub panel might be pushing the limit for breaking the sub panels feeder breaker. The breaker feeding the sub panel will have to be no bigger than 60 amps because of the main bus bar capacity of the sub panel. It would be better to install a 100 amp sub panel and then there would be a bit of a buffer and you will have the ability to add additional small load circuits.
If your furnace is 20 kW unit, the maximum amperage it can draw is 83 amps at 240 volts. If it is a two stage unit the first element will be the 5 kW and the second element sill be the 15 kW element. If you are connecting the unit to a 60 amp breaker it will only allow either the 5 or the 15 kW element on but not both. The breaker in the unit needs a voltage source brought to it from the service distribution. If this is a new installation, call an electrician as permits should be taken out for your protection. By doing this, if a fault occurs and a fire is started the first thing that the insurance company wants to know is if the installation was inspected. If you have no documentation you might not be covered.